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dc.contributor.authorFarragher, Tadhg P.
dc.contributor.authorLeen, Sean B.
dc.identifier.citationFarragher, TP, Scully, S, O Dowd, NP, Leen, SB (2013) 'Development of life assessment procedures for power plant headers operated under flexible loading scenarios'. International Journal Of Fatigue, 49 :50-61.en_IE
dc.descriptionJournal articleen_IE
dc.description.abstractA finite element methodology for thermo-mechanical fatigue analysis of a subcritical power plant outlet header under realistic loading conditions is presented. The methodology consists of (i) a transient heat transfer model, (ii) a sequential anisothermal cyclic viscoplastic model and (iii) a multiaxial, critical-plane implementation of the Ostergren fatigue indicator parameter. The methodology permits identification of the local thermo-mechanical stress–strain response at critical locations and prediction of fatigue life and cracking orientation for complex transient, anisothermal, cyclic elastic–plastic-creep material behaviour. Measured plant data, in the form of steam and pipe temperature transients and steam pressure data, are employed to identify heat transfer constants and validate the predicted thermal response, with particular attention given to plant start-up and attemperation effects. The predictions indicate out-of-phase temperature-strain response at the header inside surface and in-phase response on the outside surface. Cooling transients are predicted to control damage and crack initiation at the inner bore, whereas heating transients are predicted to have a more damaging effect at weld locations. A representative test cycle is presented, which is shown to capture the salient thermo-mechanical cyclic damage of the realistic cycle. The predicted results correlate well with industrial experience in terms of crack (initiation) orientation, location and life.en_IE
dc.description.sponsorshipScience Foundation Ireland - SFI/10/IN.1/I3015en_IE
dc.publisherElsevier ScienceDirecten_IE
dc.relation.ispartofInternational Journal Of Fatigueen
dc.subjectThermo-mechanical fatigueen_IE
dc.subjectHigh temperature viscoplasicityen_IE
dc.subjectFlexible plant operationen_IE
dc.subjectCritical-plane Ostegrenen_IE
dc.subjectComplex geometryen_IE
dc.subjectFinite elementen_IE
dc.titleDevelopment of life assessment procedures for power plant headers operated under flexible loading scenariosen_IE
dc.local.contactSean Leen, Mechanical & Biomedical Eng, Eng-2051, New Engineering Building, Nui Galway. 5955 Email:

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